A Pennsylvania man was arrested late Wednesday afternoon after police found a bag believed to be his that contained a gun, several magazines, and ammunition in South Station, Boston police said.

Robert E. Goodson, 23, of Etna, will face firearms-related charges, according to a statement from police.

Goodson had tried to enter St. Francis House at 39 Boylston St. on Tuesday around noon “with a loaded firearm in his waistband, as well as several magazines and a box of ammunition in his bag,” according to Boston police.

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When security guards told him that guns weren’t allowed inside, Goodson showed them his Pennsylvania license to carry, police said. Police later realized the license had been revoked a week earlier.

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“The male left with his firearm and stated that he would return later,” police said. “Officers initiated an investigation and advised the security officer to recontact the police should Goodson return.”

Goodson went back on Wednesday around 7:45 a.m., but did not have the gun or bag with him, according to police.

Security alerted police, who later found the bag at a baggage storage desk at the South Station Bus Terminal, police said. The bad contained a semi-automatic gun, five large capacity magazines, about 100 rounds of ammunition, a Kevlar ballistic vest, a black neoprene ski mask, and “black leather tactical style gloves,” according to police.